Magnetizing apparatus



hm 1942- A. N. HANSON Emu. 2,285,274

' nan-rum Arrmrus Filed Jan. 1;, 1940 Patented June 2, 1942 MAGNETIZIN GAPPARATUS Arvid N. Hanson,

Hinsdale, and Stanley F.

Warner, Forest Park, Ill., assignors to Western Electric Company,Incorporated, New York, N. Y., a corporation of New York ApplicationJanuary 11, 1940, Serial No. 313,374-

7 Claims.

This invention relates to magnetizing apparatus and more particularly toapparatus for insuring that permanent magnets being magnetized are heldin association with the magnetizing coils for a sufiicient length oftime to properly magnetize them.

It is an object of the present invention to provide and improvemagnetizing apparatus for properly magnetizing permanent magnets.

In accordance with one embodiment of the inventlon, magnetizing coilsare positioned beneath a table on which there is a suitable guideway forreceiving and directing relays having permanent magnets in them whichare to be magnetized and guiding them into the proper position withrespect to the magnetizing coils. A stop member is positioned in theguideway to prevent movement of the relays out of the magnetizingposition untilthe magnetizing coil cores are properly saturatedmagnetically. The stop member is connected by means of a link and levermechanism with a block of magnetic material, which is adapted to beattracted by the magnetizing coils when the magnetic field thereofreaches its maximum flux density and resilient means are provided fornormally holding the stop member in position to prevent movement of therelay.

A better understanding of the invention will be had by reference to thefollowing detailed description when considered in conjunction with theaccompanying drawing, wherein Fig. 1 is a plan view of a. magnetizingapparatus embodying the present invention;

Fig. 2 is a vertical sectional view taken along the line 2-2 of Fig. 1in the direction of the arrows showing some of the details ofconstruction, and

Fig. 3 is an enlarged detail sectional view taken on the line 33 of Fig.1 in the direction of the arrows showing a control switch forcontrolling the flow of current to the magnetizing coils.

Referring to the drawing, wherein like reference characters designatethe same parts throughout the several views, the apparatus is mounted ina bench or table 5 to the underside of which a pair of magnetizing coils6 and I are secured by means of brackets 8 and 8, respectively. Themagnetizing coils 6 and l are provided with core members l and H,respectively, which extend upwardly to the table and have suitablyattached to them pole pieces I2 and |3, respectively. A pair of wires l4and I5 are connected to a suitable source of current supply and supplythe energizing current to the coils relay 2| shown in dot and dash linesin Figs. 1 i

and 2 into the proper position between the pole pieces I2 and I3. Therelay 2| comprises a framework 22 in which there are mounted the usualfixed contacts 23 and 24 and a movable contact 25. As is usual in relaysof this type.

there is provided a horseshoe magnet 26, which is to be magnetized inthe apparatus described herein. The guideway is of such dimensions as toconform closely to the outside dimensions of the framework 22 and permitthe passage of the relay through it. The guideway 20 has a rectangularcut-out formed in the base thereof and in direct vertical alignment withthe cutout 3|) is a rectangular cutout 3| in the table 5. Positioned ina pocket 32 in the table are a'pair of contacts 33 and 34, which serveto complete a circuit between leads 35 and 36 for controlling the flowof energizing current through the wires I4 and I5 to the magnetizingcoils 6 and I. The contact 34 has a block of insulating material 31mounted on it and adapted to be moved by the framework 22 of a relay 2|when the relay is positioned between the pole pieces l2 and H. The uppersurface of the block 31 slopes upwardly slightly so that as the relay 2|is pushed into position between the pole pieces l2 and II from right toleft (Fig. 1) the framework 22 of the relay will depress the block 31and move contact spring 34 into engagement with contact spring 33,thereby to supply current to the magnetizing coils 6 and Fixed to theupper'surface of the table 5 is a guideblock having an aperture 4Ctherein in which a rod 41 is slidably mounted. The rod 41 has a block 48of magnetic material fixed to one end of it and is pivotally connectedthrough a link 49 to a lever 50, which is, in turn, pivotally mounted at5| on the upper surface of the table 5. The lever 50 has a coil spring52 connected to it and to the table 5, normally to urge the lever 50about its pivot 5| in a counter-clockwise d|- rection. to hold the block48 against the guide block 45. Fixed to'the left end (Fig. 1) ofthelever 50 is a rod 53 which has pivoted a't its other end a stop member54.- A guide member 55 has an aperture 56 formed in it for receiving thestop member 54 and guiding it through the side wall of the guideway 20and into the path of a relay 2|. The stop member 54, when in theposition shown, will be in the path of a relay 2| being slid through themagnetizing apparatus in the guideway 20 and will position the horseshoemagnet 26 of the relay in the proper place between the pole pieces l2and [3 until the magnetizer pole pieces 12 and I 3 are properlysaturated magnetically. The strength of the coil spring 52 ,is' suchthat the block 48 of magnetic materialwill not be attracted to the polepiece l2 of the magnetizing apparatus until the pole pieces and i3 aremagnetically saturated, and when' the magnetizing apparatus reaches thesaturation point, the magnetic flux will overcome the tension of spring52 and the block 48 will be attracted toward the pole piece l2, therebyto rock thelever 50 about its pivot point and pull the stop member 54out of the path of the relay 2!.

In the operation of the device, polarized relays 2I, having horseshoeshaped members of magnetic material in them, may be pushed through-theguideway 20 from right to left (Fig.

1') to magnetize the horseshoe shaped members.-'

When the framework 22 of the relay 2 I ,in its passage through theguideway 20, strikes the block 31, the block 31 will be moved downwardlyto close a circuit between the contacts 34 and 33 and supply energizingcurrent to the magnetizing coils 6 and I. 'Shortly after the circuit hasbeen completed between contacts 33 and 34, the

for directing relays past the pole pieces and through said area, a stopmember positioned adjacent the pole pieces for preventing movementthrough the guideway of the relay whose permanently magnetizable portionis to be mag netized, a resilient means for normally holding said stopmember in the path of the relay whose magnetizable portion is ,to' bemagnetized, a member ofmagnetic material positionedadjacent one of thepole pieces of the magnetizing apparatus and adapted to be attractedthereby, and a link and lever mechanism interconnecting the stop memberand the member ofmagnetic material.

'3. A magnetizing apparatus for magnetizing permanently magnetizablearticles comprising a magnetizing unit having pole pieces to concentratethe magnetic flux in a predetermined area,

a guideway for directing articlesgpast the pole pieces and through saidarea, a stop member positioned adjacent the pole piece for preventingmovement through the guideway ofan article to be magnetized, aresilientmeans for normally holding said stop member in the path of thearticle to be magnetized, a member of mag- "netic 'material positionedadjacent one of the framework 22 will strike the stop member 54,1

thereby to prevent further movement of the relay 2| until the polepieces l2 and I 3 aresatur rated magnetically at which time the magneticflux of the magnetizing apparatus will attract the block .48 to pull thestop member-E4 "out of the path of the relay 21 and the relay 2| maythen be pushed to the left through the guideway' to complete themagnetization of the horseshoe shaped magnet 26. It will be noted thatthe block 31 .will not move upwardly until the v relay has passed overit to carry the magnet 26' through the magnetic field set up between thepole pieces l2 and I3, and therefore the greatest nu); concentration ofthe horseshoe magnet 26 will be adjacent its open ends.

Although a specific; embodiment-of the inbe limited only urated, aresilient means for normally holding said stop member in the path of thearticle to j be magnetized, a member of magnetic material so positionedadjacent one of the pole pieces of the magnetizing apparatuses to beattracted thereby only when the magnetizable articlebecomes saturated,and a link and lever mechanism interconnecting. the stop member and themember. of magnetic material.

2; A magnetizing apparatus for, imparting magnetism to the permanentlymagnetizable 'portion of a relay comprising a magnetizing unit havingpole pieces to concentrate the magneticflux in a predetermined area, aguideway pole pieces of the magnetizing apparatus and adapted to beattracted thereby, a link and a lever mechanism interconnecting the stopmember and the member of magnetic material, and a switch positioned insaid guideway to be. actuated by an artic e being magnetized forcontrolling the supply of current to the magnetizing unit.

4. A magnetizing apparatus for magnetizing permanently magnetizablearticle comprising a magnetizing unit having pole pieces to concentratethe magnetic flux in a predetermined area, a guidewayfor directingarticles past the pole pieces .and through said area, a stop memberpositioned adjacent the pole pieces for preventing movement through theguideway of an article to be magnetized, a resilient means for normallyholding said stop member in the path of the article to be magnetized, amemberof mag? netic material positioned adjacent oneof the,

pole pieces of the magnetizing apparatus and adapted to be attractedthereby when the magnetizing unit is. magnetically saturated,' a linkand a lever mechanism interconnecting the stop member and the member ofmagnetic material. and a switch positioned in said guidewayto beactuated by an article being magnetized for controlling the supply ofcurrent to the magnetizing unit, said switch being adapted to maintainthe current supply to the magnetizing unit while the stop memberprevents movement of: the article and for a short time thereafter;

51 In a magnetizing apparatus, magnetizing coils for imparting magnetismto a permanently magnetizable member, a. stopmember for normallystopping said member to be magnetized in a'predetermined position untilsaid magnetizable member is magnetically saturated, and a magneticmember so shaped and so located in the held of the magnetizing coils;asto be'm'oved by saidfield only when the magnetizablemember has becomesaturated, the magnetic member being connected to the-stop member forautomatically moving said stop-memberout of its stopping position bymovement of the magnetic member resulting from saturation oil themagnetizable member.

6. In a. magnetizing apparatus for magnetically saturating permanentlymagnetizable articles,

a pair of magnetizing coils having pole pieces for concentratingmagnetizing flux "adjacent an article being permanently magnetized,astop member positioned to locate an article between said pole pieces, ablock of magnetic material movably positioned adjacent one of said polepieces so shaped and so positioned as to be moved by the magnetic fieldof said one pole piece only when the article being magnetized issaturated magnetically, and means interconnecting the block of magneticmaterial and stop member whereby movement of the block in one directionunder the influence of the magnetizing coils will cause the stop memberto move out of the path of the article.

'7. In a magnetizing apparatus for magnetizing permanently magnetizablemagnetic members, a pair of magnetizing coils having pole pieces forconcentrating the magnetizing flux from the coils in a predeterminedarea to impart magnetism to a permanently magnetizable, member in saidarea, a guideway for guiding said magnetizable member in its passagethrough said area, a switch actuated by the magnetizable member in saidarea for controlling the supply of current to said coils, a stop memberfor normally blocking move ment of the article through said area in theguideway until said magnetizable member is magnetically saturated, and amagnetic member so shaped and so located in the field 01' the manetizing coils as to be moved by said field only when the magnetizablemember has become saturated, the magnetic member being connected to thestop member for automatically moving the stop member out of the path ofthe article by movement of the magnetic member resulting from saturationof the magnetizable member.

ARVID N. HANSON. STANLEY F. WARNER.

